SZ123

With only two transistors working in parallel is achieved this output stage that provides a total power of 360 watts with only 40 entries.

The focus of this project are two power transistors RF signature Philips Semiconductors BLX15 running in a parallel configuration. Only three of the resistors should be 10 watts and coal, both transistors must be properly dissipated to avoid overheating.

All coils marked with BI-type printing, which are drawn in by the board copper tracks. RFC (one at each base) are conventional RF crashes. CH is a coil of 2 turns of 1.5mm wire on ferrite to shocks. The coils L (one in each collector) are formed by 3 turns of 1.5mm wire on air 9mm.

The setting of this stage are from left to right, from the entrance to the exit load if possible ghost.

Here is the actual design of the circuit which must be printed double-sided (the other should be completely copper) and epoxy material.

The components are placed along the following guidelines:

Once armed, the calibration module can be placed inside a cabinet (preferably metal). It is highly recommended to mount the power supply inside the same cabinet in order to minimize the absorption of noise.

Given the power (in our case) decided to give the unit power of electric fans. The circuit is powered by 50 volts and 7 ampers (almost anything).